Production and characterisation of biochar from tea waste and its nickel removal capacity from aqueous solutions

Akgül, Gökçen; Ateş, Ayten; Yaşar, Gökhan; Hatipoğlu, Hakan

doi:10.1504/pie.2017.088846

Cited by 6 publications

(4 citation statements)

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“…The peaks at 2358, 2918 and 2848 cm −1 are attributed to C≡N stretch [ 36 ] and the C–H and −CH 2 - stretching vibration modes [ 1 ]. The absorption peaks in the region of 1458–837 cm −1 indicates the presence of esters and ethers groups [ 37 ].…”

Section: Resultsmentioning

confidence: 99%

“…As can be seen for both samples, the first degradation step with a weight loss of 6.45% for UTB and 8.84%, for UTB-TT, respectively, occurred between 40–130 °C due to the elimination of moisture and volatile compounds [ 3 ]. The UTB biomass exhibits a maximum weight loss of 58.53% around 352 °C that is caused by the pyrolysis of the cellulose and hemicellulose content [ 37 ]. The slow weight-loss process of lignin pyrolysis took place for UTB in the region from 520 to 700 °C ( Figure 6 ).…”

Section: Resultsmentioning

confidence: 99%

“…hemicellulose content [37]. The slow weight-loss process of lignin pyrolysis took p UTB in the region from 520 to 700 °C (Figure 6).…”

Section: Thermogravimetric Analysis: Heat Treatment Of Bio-sorbents A...mentioning

confidence: 99%

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Black Tea Waste as Green Adsorbent for Nitrate Removal from Aqueous Solutions

Bondarev,

Popovici,

Călin

et al. 2023

Materials

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The aim of the study was to prepare effective low-cost green adsorbents based on spent black tea leaves for the removal of nitrate ions from aqueous solutions. These adsorbents were obtained either by thermally treating spent tea to produce biochar (UBT-TT), or by employing the untreated tea waste (UBT) to obtain convenient bio-sorbents. The adsorbents were characterized before and after adsorption by Scanning Electron Microscopy (SEM), Energy Dispersed X-ray analysis (EDX), Infrared Spectroscopy (FTIR), and Thermal Gravimetric Analysis (TGA). The experimental conditions, such as pH, temperature, and nitrate ions concentration were studied to evaluate the interaction of nitrates with adsorbents and the potential of the adsorbents for the nitrate removal from synthetic solutions. The Langmuir, Freundlich and Temkin isotherms were applied to derive the adsorption parameters based on the obtained data. The maximum adsorption intakes for UBT and UBT-TT were 59.44 mg/g and 61.425 mg/g, respectively. The data obtained from this study were best fitted to the Freundlich adsorption isotherm applied to equilibrium (the values R2 = 0.9431 for UBT and R2 = 0.9414 for UBT-TT), this assuming the multi-layer adsorption onto a surface with a finite number of sites. The Freundlich isotherm model could explain the adsorption mechanism. These results indicated that UBT and UBT-TT could serve as novel biowaste and low-cost materials for the removal of nitrate ions from aqueous solutions.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Black Tea Waste as Green Adsorbent for Nitrate Removal from Aqueous Solutions

Bondarev,

Popovici,

Călin

et al. 2023

Materials

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“…They have reported that the biochar yield decreases with the increase in temperature; however, pretreatment increases the yield. Akgül et al carried out pyrolysis of tea waste at temperatures of 300-400 • C [53]. They have reported that the carbonization and aromaticity of biochar improve with the increase in pyrolysis temperature.…”

Section: Methodsmentioning

confidence: 99%

Production of Biochar and Its Potential Application in Cementitious Composites

et al. 2021

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In cement composites, usually, reinforcement is provided to restrict the crack development and their further propagation under service conditions. Typically, reinforcements utilized in cementitious composites range from nanometer scale to millimeter scale by using nano-, micro-, and millimeter-sized fibers and particles. These reinforcements provide the crack arresting mechanisms at the nano/microscale and restrict the growth of the cracks under service loads, but usually, the synthesis of nano/microfibers, and afterward their dispersion in the cementitious materials, pose difficulty, thus limiting their vast application in the construction industry. Carbonaceous inerts are green materials since they are capable of capturing and storing carbon, thus limiting the emission of CO2 to the atmosphere. In the present study, a comprehensive review of the synthesis of low cost and environmentally friendly nano/micro carbonaceous inerts from pyrolysis of different agricultural/industrial wastes, and afterward, their application in the cementitious materials for producing high performance cementitious composites is presented, which have the potential to be used as nano/micro reinforcement in the cementitious matrix.

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Biosorptive removal of fluoride from wastewater using tea domestic waste biochar

Aboulsoud

2024

Environ Dev Sustain

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The biochar of tea domestic waste was applied to eliminate F− from their aqueous artificial solutions and real contaminated wastewater. Pre-pyrolysis chemical activation method was used to synthesize biochar from tea domestic waste. Two modification methods were applied, acidic modification using H3PO4 (H-modified form) and basic modification using NaOH (OH-modified form). The synthesized forms of tea biochars were characterized by the determination of ash content, bulk density, Brunauer–Emmett–Teller analyses to detect the pore size, specific surface area, and pore volume, Elemental analyses to detect C, H, O, and N contents, Thermogravimetric analyses to detect the thermal behavior of biochars, and Fourier Transform Infrared analyses to detect the functional active groups of biochars. The synthesized forms of tea biochars were optimized for fluoride removal from aqueous solutions via filter bags method and applied in enhancement of the quality of wastewater from the factories of the new Borg El-Arab City, Egypt. The highest biosorption efficacy achieved was 109.18 mg F−/g biochar using the H-modified form under the optimum conditions of biochar dosage: pH: 2, 0.25 g/l, temperature: 50 °C, initial concentration of F−: 500 mg/l, exposure time: 30 min, and agitation rate: 300 rpm. The OH-modified form achieved less than half biosorption efficacy which reached 49.39 mg F−/g biochar. The existence of competitive anions in the solution had a negative influence on F− biosorption efficacy, where the impact followed the order of PO43− > SO42− > Cl− > NO3− > HCO3−. The H-modified tea biochar proved to be a promising biosorbent for industrial wastewater treatment by achieving removal efficacy ranges of 80.89–93.31% and returning all violated F− concentrations to the allowable limit. Sustainable development can be greatly supported by using domestic tea wastes in the removal of F− due to the dual disposal of waste and contaminants at the same time. The tea wastes are eco-safe and cheap biosorbent material can be utilized as a precursor for an efficacious tool for the elimination of F− from artificial solutions in addition to real wastewater.

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Production and characterisation of biochar from tea waste and its nickel removal capacity from aqueous solutions

Cited by 6 publications

References 0 publications

Black Tea Waste as Green Adsorbent for Nitrate Removal from Aqueous Solutions

Black Tea Waste as Green Adsorbent for Nitrate Removal from Aqueous Solutions

Production of Biochar and Its Potential Application in Cementitious Composites

Biosorptive removal of fluoride from wastewater using tea domestic waste biochar

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